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International Journal of MicrobiologyVolume 2009 2009, Article ID 731786, 17 pages

Research Article

Laboratoire Microorganismes et Biomolécules Actives, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Tunis, Tunisia

Laboratoire de Microbiologie et de Biotechnologie des Environnements Chauds, UMR180, IRD, Universités de Provence et de la Méditerranée, ESIL case 925, 13288 Marseille cedex 9, France

Received 8 April 2009; Accepted 27 August 2009

Academic Editor: Thomas L. Kieft

Copyright © 2009 Abdeljabbar Hedi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Bacterial and archaeal aerobic communities were recovered from sediments from the shallow El-Djerid salt lake in Tunisia, and their salinity gradient distribution was established. Six samples for physicochemical and microbiological analyses were obtained from 6 saline sites in the lake for physico-chemical and microbiological analyses. All samples studied were considered hypersaline with NaCl concentration ranging from 150 to 260 g-L. A specific halophilic microbial community was recovered from each site, and characterization of isolated microorganisms was performed via both phenotypic and phylogenetic approaches. Only one extreme halophilic organism, domain Archaea, was isolated from site 4 only, whereas organisms in the domain Bacteria were recovered from the five remaining sampling sites that contained up to 250 g-L NaCl. Members of the domain Bacteria belonged to genera Salicola, Pontibacillus, Halomonas, Marinococcus, and Halobacillus, whereas the only member of domain Archaea isolated belonged to the genus Halorubrum. The results of this study are discussed in terms of the ecological significance of these microorganisms in the breakdown of organic matter in Lake El-Djerid and their potential for industry applications.

Autor: Abdeljabbar Hedi, Najla Sadfi, Marie-Laure Fardeau, Hanene Rebib, Jean-Luc Cayol, Bernard Ollivier, and Abdellatif Boudabous



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